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JPH09182182

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09182182
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone adapter for connecting a microphone output plug to an input jack having a different
shape or standard, and more particularly to connecting a professional microphone to a consumer
microphone jack. For microphone adapter.
[0002]
2. Description of the Related Art In the field of broadcast and video production, in view of
demand as a software supply source, a commercial video camera apparatus having much better
image quality and sound quality than a general consumer video camera apparatus is used. Use
high quality microphones for voice recording. A connector used to connect such a microphone to
a commercial video camera device also uses a special specification to ensure high reliability. For
example, as a microphone connector, a high-grade microphone connector called "cannon
connector" has been used.
[0003]
Such a professional connector has a completely different shape from the external microphone
jack of a consumer video camera device. Generally, it was considered that the performance of
consumer video camera devices was considerably inferior to the performance of professional
01-05-2019
1
video camera devices, so each video camera device is not used for the same application, and the
connector shape is It didn't matter.
[0004]
However, with the development of recording media, imaging devices and electronic circuit
technologies in recent years, consumer video camera devices have significantly higher image
quality than conventional ones, so they can be used in some fields such as broadcasting. It came
to prepare. In particular, consumer video camera devices are characterized by their small size,
light weight, and high functionality, and so-called video journalists are often used as news
gathering tools.
[0005]
In the news gathering using such a consumer video camera device, the sound quality of the builtin microphone integrated into the video camera device is not sufficient compared to the good
image quality, and it has been necessary to use an external microphone. That is, there are many
factors in which the sound quality is determined by the performance of the microphone, and the
built-in microphone of the conventional consumer video camera device does not have sufficient
performance as a business sound pickup device.
[0006]
In addition to the voice for coverage, environmental sound for coverage (voice around the crowd,
etc.) is needed to increase the sense of reality. In order to accurately capture the environmental
sound in the shooting direction, it is necessary to record only the sound coming from the target
direction with high sound quality, so the microphone for recording the environmental sound
needs to be super-directivity and high sound quality. However, one-point stereo microphones
used as built-in microphones generally have wide directivity, have only adequate sound quality
for use as accessories, and are unsuitable for recording environmental sounds. For this reason as
well, it was necessary for news reporters to use professional microphones such as superdirective
gun microphones as external microphones instead of built-in microphones.
[0007]
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2
However, even if a work microphone is connected to the microphone jack of a consumer video
camera apparatus, the following problems occur, and sufficient performance of the business
microphone can be obtained. There was a problem that I could not
[0008]
The first problem is that the microphone jack provided in the consumer video camera apparatus
is supplied with DC power to the audio signal contact, as it is called plug-in power.
This is because it is assumed that a condenser microphone that needs to be supplied with power
is connected as an external microphone. If a microphone not requiring power is connected to a
microphone jack supplied with DC power, such as a business dynamic microphone, direct current
flows in the coil of the microphone to cause noise and noise.
[0009]
The second problem is that the input impedance of the microphone jack provided in the
consumer video camera apparatus does not match the output impedance of the dynamic
microphone. If the impedances do not match, the power that can be supplied may decrease,
which may cause distortion and the like.
[0010]
That is, although the external microphone is indispensable to use the consumer video camera
device for business use, the shape of the connector does not conform, and the voice is
deteriorated even if the force business microphone is connected. A disadvantage has arisen and
the advantage of connecting a professional microphone has been lost.
[0011]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera
adapter for connecting an external input device such as a professional microphone to a consumer
video camera device without impairing its performance.
[0012]
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3
A microphone adapter according to claim 1 comprises an audio input plug (mini plug etc.) for
connection to an audio input jack (so-called mini jack (mono, stereo, etc.)), and a business
microphone Connect an audio jack for audio input plug and an audio input contact for business
input jack electrically to connect a plug (plug for cannon connector etc.), and an audio input plug
for audio input plug, A connection conversion means (an impedance conversion resistance, a
transformer, etc.) for electrically connecting the ground contact of the input plug and the ground
contact of the commercial jack is configured.
[0013]
A microphone adapter according to claim 2 is the microphone adapter according to claim 1,
further comprising a consumer jack (mini jack etc.) for connecting a consumer plug (mini plug
etc.), and the connection conversion means is The audio contact of the audio input plug and the
audio contact of the consumer jack are connected, and the grounding contact of the audio input
plug and the grounding contact of the consumer jack are connected.
[0014]
The microphone adapter according to claim 3 is the microphone adapter according to claim 1,
further comprising a pin jack for connecting a pin plug, and the connection conversion means is
for the voice contact of the voice input plug and for the voice of the pin jack. Connect with the
contact point, and connect the grounding contact of the audio input plug and the grounding
contact of the pin jack.
[0015]
The microphone adapter according to claim 4 is the microphone adapter according to claim 1,
provided with a plurality of business use jacks.
[0016]
The microphone adapter according to claim 5 is the microphone adapter according to claim 2,
comprising a plurality of consumer jacks.
[0017]
The microphone adapter according to claim 6 is the microphone adapter according to claim 3
provided with a plurality of pin plugs.
[0018]
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4
In the microphone adapter according to claim 7, when a consumer jack (a mini jack with a
contact or the like) inserts an external plug, a first contact that contacts the external plug, and a
first contact when the external plug is not inserted The second contact is electrically connected
to the contact and is electrically disconnected from the first contact when the external plug is
inserted. The first contact is electrically connected to the audio contact of the audio input plug.
The microphone adapter according to claim 2 or 5, wherein the second contact is electrically
connected to an audio contact of another jack.
[0019]
9. The microphone adapter according to claim 8, wherein the connection conversion means
matches the input impedance of the jack connected to the audio input plug with the output
impedance of the commercial microphone connected to the commercial jack (resistor,
transformer The microphone adapter according to claim 1 or 4, further comprising
[0020]
10. The microphone adapter according to claim 9, wherein the connection conversion means
includes a matching circuit for matching the input impedance of the jack connected to the audio
input plug with the output impedance of the device connected to the consumer jack. It is a
microphone adapter given in item 5.
[0021]
11. The microphone adapter according to claim 10, wherein the connection conversion means
comprises a matching circuit for matching the input impedance of the jack connected to the
audio input plug with the output impedance of the device connected to the pin plug. 6 is the
microphone adapter described in 6;
[0022]
The microphone adapter according to claim 11, wherein the connection conversion means is
provided with a DC component removal circuit (capacitor, filter, etc.) for removing a DC
component input from the audio contact of the audio input plug. It is a microphone adapter as
described in any of ten.
[0023]
13. The microphone adapter according to claim 12, wherein the connection conversion means
intervenes an attenuator for matching the input signal level of the audio input jack between the
audio contact of each jack and the audio contact of the audio input plug. A microphone adapter
01-05-2019
5
according to any one of claims 1 to 11.
[0024]
The microphone adapter according to claim 13, wherein the connection switching means
comprises a switch for selecting a path in which the attenuator is interposed and a path in which
the attenuator is not interposed.
[0025]
A microphone adapter according to claim 14 is a microphone adapter provided with locking
means for locking the microphone adapter to an object to be locked (a grip or the like of a video
camera apparatus) in the microphone adapter body.
[0026]
16. The microphone adapter according to claim 15, wherein the locking means locks a
predetermined enclosing member (a U-shaped metal plate or the like surrounding the grip of the
camera) surrounding the object to be locked, and the enclosing member to the microphone
adapter body. The microphone adapter according to claim 14, further comprising: a fixing
member (screw, screw, bolt, nut, etc.)
[0027]
17. The microphone adapter according to claim 16, wherein the locking means is fixed to the
microphone adapter body, and the pinching member sandwiches the locking object with the
microphone adapter body by inserting the locking object from the opening. L-shaped sheet metal
and the like, and a pressure-bonding member (screw type member etc.) provided on the
sandwiching member and locking the microphone adapter to the engagement target by pressing
the pinched engagement target onto the microphone adapter main body 15. The microphone
adapter according to claim 14, wherein the microphone adapter comprises:
[0028]
18. The microphone adapter according to claim 17, wherein the locking means is fixed to the
microphone adapter main body, is constituted by a flexible belt-like member (belt or the like)
provided with a fastener, and the belt-like member is a locking target 15. The microphone
adapter according to claim 14, wherein the microphone adapter body is attached to the locking
object by tightening a winding fastener around the video camera device body or the like.
01-05-2019
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[0029]
The microphone adapter according to claim 18, wherein the locking means is fixed to the
microphone adapter main body, and the insertion plate for inserting into the shoe which is the
locking object, and the insertion plate is attached to and detached from the shoe by tightening.
15. The microphone adapter according to claim 14, further comprising: a screw member for
freely locking.
[0030]
20. The microphone adapter according to claim 19, wherein the locking means is fixed to the
microphone adapter main body and a screw shaft for locking the microphone adapter main body
to a screw hole (tripod mounting screw hole etc.) of the locking object; 15. The microphone
adapter according to claim 14, further comprising: a screw member rotatably provided on the
screw shaft, and screwed onto an object to be locked when the screw shaft is engaged with the
screw hole.
[0031]
The microphone adapter according to claim 20, wherein the locking means is an elastic member
(plastic) that prevents the locking object and the locking means from coming into direct contact
with the surface where the locking object and the locking means are in contact. The microphone
adapter according to claim 14, wherein a plate, rubber, sponge or the like is provided.
[0032]
22. The microphone adapter according to claim 21, wherein the microphone adapter body
comprises at least one business use jack, and an audio input plug for connection to an audio
input jack via a cord line. It is a microphone adapter as described in any.
[0033]
According to the invention of claims 1 to 13, the microphone adapter has a jack for business use
microphone, and transmits an audio signal from the business use microphone connected to this
jack to the speech input jack connected to the sound input plug. .
At this time, since the connection conversion means is in charge of connection between the
professional microphone and the input of the audio input jack, connection between the jack such
as a consumer video camera and the professional microphone can be performed.
01-05-2019
7
[0034]
According to the microphone adapter of the second aspect, the voice input plug is connected not
only to the business use jack but also to the consumer use jack, so that a consumer use
microphone or the like can be connected in addition to the business use microphone.
[0035]
According to the microphone adapter of the third aspect, the voice input plug is connected not
only to the business use jack but also to the pin jack. Therefore, it is possible to connect the line
output of an external device other than the business use microphone.
[0036]
The jacks electrically connected to the voice input plug may be independent, or plural jacks may
be provided as described in the fourth to sixth aspects.
Also, a plurality of commercial jacks, consumer jacks or pin jacks may be combined and provided.
[0037]
According to the microphone adapter of the seventh aspect of the invention, particularly when
using a jack having a connection switching contact as a consumer jack, connection from a
commercial jack by inserting a consumer plug from the outside into the consumer jack Are
separated.
For this reason, when using a consumer microphone, the connection can be switched from the
professional microphone to the consumer microphone simply by plugging the consumer jack.
[0038]
According to the microphone adapter of the eighth aspect, the matching circuit performs
impedance matching between the output impedance of the professional microphone of, for
01-05-2019
8
example, about 600 Ω and the input impedance of the voice input jack of about 10 kΩ.
[0039]
According to the microphone adapter of claim 9, the matching circuit performs impedance
matching between the impedance between the terminals of the audio input jack and the
impedance of each jack, for example, when a plurality of consumer jacks are provided.
[0040]
According to the microphone adapter of the tenth aspect, the matching circuit performs
impedance matching between the terminal jack impedance of about 50 kΩ and the terminal
impedance of the voice input jack of about 10 kΩ, for example.
[0041]
According to the microphone adapter of claim 11, the DC component removing circuit removes
the DC component supplied from the voice input jack via the voice signal line, and passes only
the voice signal which is an AC component. No DC component is output to the jack, consumer
jack or pin jack.
Therefore, no DC component is supplied to the audio signal output of a professional microphone
such as a dynamic microphone or a consumer microphone that does not require a power supply,
and no DC component is supplied to the line output.
[0042]
According to the microphone adapter of claim 12, the attenuator is an output of a large output
signal level (for example, +4 dBm to -20 dBm) line system, and an allowable input signal level of
a small (for example, -60 dBm) voice input jack input level Attenuate the level of the audio signal
until it meets
Therefore, distortion does not occur because the input signal level of the line system is too
strong.
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[0043]
According to the microphone adapter of claim 13, when inputting a signal from the jack of the
line system having a large signal level, the switch is switched to the connection in which the
attenuator is interposed.
When inputting a signal from a microphone with a small signal level, the switch is switched so as
to be connected without the attenuator.
[0044]
According to the invention of claims 14 to 21, since the locking means fixes the microphone
adapter main body to the locking target object, the user can use the grip object of the video
camera apparatus or the like as the locking target object. Can be equipped with a microphone
adapter.
[0045]
According to the microphone adapter of claim 15, the enclosing member is formed so as to
surround the object to be locked such as a grip of the camera, and the fixing member remains in
a form in which the object to be locked is enclosed by the enclosing member and the microphone
adapter. Fixed by
The microphone adapter is fixed by completely surrounding a locking object such as a grip.
[0046]
According to the microphone adapter of the sixteenth aspect, the crimping member crimps the
locking object and the microphone adapter in a state where the locking object such as a video
camera device is inserted from the opening.
Therefore, fixation is performed in the form which can perform attachment or detachment easily.
01-05-2019
10
[0047]
According to the microphone adapter of claim 17, the belt-like member is wound around the
locking object, and the microphone adapter main body is fixed to the locking object by the
fastener.
The microphone adapter can be fixed even in the case of a locking object having no plate-like
body such as a grip.
It can also be attached to equipment such as a video camera or a tape recorder having a special
shape such as a box shape.
[0048]
According to the microphone adapter of claim 18, the microphone adapter main body is locked
to a video camera apparatus or the like provided with a shoe for microphone installation.
The same handling as a normal camera accessory is possible.
[0049]
According to the microphone adapter of claim 19, when the screw shaft is screwed into a screw
hole such as a tripod mounting screw hole, the screw grooves mesh with each other.
Further, the screw member is rotated on the screw shaft, and is crimped to the locking object,
thereby locking the microphone adapter main body to the screw shaft.
[0050]
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11
According to the microphone adapter of claim 20, since the elastic member serves as a cushion,
the object to be locked is not damaged, and the locking means does not deviate from the object
to be locked.
[0051]
According to the microphone adapter of claim 21, the microphone adapter main body can be
installed at a position apart from the jack to which the audio input plug is connected.
It is also possible to attach the microphone adapter body at a position (different apparatus or the
user himself) apart from the apparatus where the audio input jack is present.
[0052]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the preferred drawings.
[0053]
(I) First Embodiment <External Shape> FIG. 1 shows an outline view of a microphone adapter
according to a first embodiment of the present invention.
FIG. 1A is a perspective view of the microphone adapter of this embodiment.
The microphone adapter of this embodiment is provided with a canon connector jack CJ1 on the
front of the microphone adapter main body 1a (see FIG. 6B) and two minijacks MJ1 and MJ2 on
the back (see FIG. 6C).
[0054]
The microphone adapter body 1a is a housing for attaching a plurality of jacks.
[0055]
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12
The jack CJ1 for cannon connector (for example, model number XLR-3-11C) is a connector to
which a plug CP1 for cannon connector (for example, model number XLR-3-12C) of an external
microphone is connected.
The mini jacks MJ1 and MJ2 are jacks for connecting a consumer personal mini plug.
The U-shaped member 2a is an enclosing member for fixing the microphone adapter main body
1a to the video camera.
The U-shaped member 2a is a member molded in a U-shape, and it is necessary to provide
sufficient strength.
The mat 3a is an elastic member that prevents the video camera from being scratched by direct
contact between the video camera and the steel body portion of the microphone adapter when
the microphone adapter main body 1a is fixed to the video camera.
Use plastic-shaped plates, elastic materials such as rubber and sponge.
The mini plug MICP1 is an audio input plug for connecting to a microphone jack of a video
camera or the like.
The cord C1 is a plug for supplying an audio signal from each jack of the microphone adapter
body 1a to the mini plug MICP1.
[0056]
As the material of the microphone adapter body 1a and the U-shaped member 2a, metal which is
a conductive material having a shielding effect is used, and a material having sufficient strength
such as ABS resin, FBR (fiber reinforced plastic), etc. is used. It is also good.
01-05-2019
13
In addition, in order to prevent injury to the handling person, it is preferable to provide a
predetermined roundness at the corner portion of the molded material.
[0057]
<Circuit> FIG. 2 is a circuit diagram for explaining the connection relationship between the
connection conversion circuit 10a provided in the microphone adapter main body 1a of the first
embodiment and each jack.
In this embodiment, a low impedance type (output terminal resistance 600 Ω) dynamic
microphone is assumed as the microphone connected to the canon connector jack CJ1.
Further, as a microphone connected to the minijacks MJ1 and MJ2, a high impedance type
(output terminal resistance 50 kΩ) is assumed.
Since it is common to connect a consumer condenser microphone to the microphone jack MICP1,
it is assumed to be a high impedance input.
[0058]
The jack CJ1 for cannon connector has three pins from the first pin to the third pin.
The jack shown in FIG. 2 is called American type, and the 1st pin is assigned to shield, the 2nd
pin is assigned to hot (+), and the 3rd pin (-) is assigned to cold.
Connect pin 1 (shield) and pin 3 (cold) to the external shield for grounding.
When the standard of the microphone to be connected is a connector of European type, the
relationship between the second pin and the third pin may be reversed.
01-05-2019
14
[0059]
The mini jacks MJ1 and MJ2 are monaural mini jacks, and for example, connect the R contact
(for right audio) of the mini plug MICP1 to MJ1 and the L contact (for left audio) to MJ2.
In this case, the microphone connected to MJ 1 is for the right voice, and the microphone
connected to MJ 2 is for the left voice.
However, the mini jack MJ1 or MJ2 may be replaced with a jack having three contacts for stereo,
and the R contact and the L contact of the mini plug MICP1 may be connected to the R contact
and the L contact of the mini jack, respectively.
[0060]
Resistors R1 and R2 serve as the matching circuit of the present invention.
The resistor R1 performs impedance matching of the minijack MJ1, and the resistor R2 performs
impedance matching of the minijack MJ2. Since a high impedance type (output terminal
resistance 50 kΩ) is assumed as a microphone connected to the minijacks MJ1 and MJ2, for
example, a 47 kΩ resistor is used as a resistance value of R1 and R2. In addition, when a high
impedance microphone is connected to a microphone jack whose input impedance is low
impedance, power loss is large, and it is desirable to perform impedance matching. However,
when connecting a low impedance microphone to a high impedance microphone jack, there is no
large power loss, so as in this embodiment, the audio signal terminal (hot) of the jack for the
direct canon connector and the audio signal contact of the microphone jack It may be connected.
[0061]
The capacitors C1 and C2 function as the DC component removing circuit of the present
invention, and use capacitors (for example, 47 μF or more: electrolytic capacitors, tantalum
electrolytic capacitors, etc.) having a large capacity to sufficiently pass low frequency signals (20
Hz to 20 kHz). When using an electrolytic capacitor, select one that can withstand the DC power
01-05-2019
15
supply voltage supplied to the microphone jack. The polarity is also carefully connected so that
the microphone jack side becomes positive.
[0062]
<Mounting Method> FIG. 3 shows a mounting explanatory view of the microphone adapter of the
first embodiment. As shown in FIG. 3, the microphone adapter of the first embodiment is
connected to the grip of the video camera.
[0063]
The video camera 20 is a consumer video camera and can be carried by the grip 21. The gun
microphone 22 is a microphone integrated into a directional camera, and records sound from the
direction in which the lens 23 is directed. The microphone jack 24 is a voice input jack. It is a
stereo microphone jack for an external microphone, and supplies a power supply voltage for
driving a condenser microphone to an audio signal contact.
[0064]
The microphone adapter 1 a of this embodiment is disposed on the back of the grip 21. The Ushaped member 2a is fixed to the microphone adapter main body 1a in a state where the grip 21
is inserted inside the U-shaped. That is, the microphone adapter 1a is fixed to the video camera
20 by screwing the U-shaped member 2a into a screw hole provided in the microphone adapter
main body 1a with a screw B which is a fixing member. The microphone plug MICP 1 of the
microphone adapter is connected to the microphone jack 24.
[0065]
FIG. 4 shows the installation completion of this microphone adapter. As shown in FIG. 4, since the
microphone adapter is securely fixed to the grip, the canon connector plug CP1 of the dynamic
microphone M can be connected. In addition, mini plugs MP1 and MP2 such as external
condenser microphones can be connected to the mini jacks MJ1 and MJ2.
01-05-2019
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[0066]
<Advantage> The microphone adapter of the first embodiment having the above-described
configuration has the following advantages. i) A low-impedance dynamic microphone and a
condenser microphone that do not require power can be connected to the external microphone
jack of a consumer video camera via this microphone adapter.
[0067]
ii) Since the elements required for the connection conversion circuit are minimized, the
microphone adapter body can be miniaturized.
[0068]
iii) By connecting external microphones to the two mini jacks, left and right voices can be
collected by the respective microphones.
[0069]
iv) Even if the power supply voltage is supplied to the mini jack of the video camera, this DC
voltage is removed.
Therefore, the noise generated by the direct current component flowing to the microphone can
be suppressed.
[0070]
v) Due to the shape of the U-shaped member, it is mainly suitable for attachment to video
cameras with grips.
[0071]
vi) Prevent the mat from scratching the video camera.
[0072]
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17
(II) Second Embodiment A second embodiment of the present invention is different from the first
embodiment, and relates to a microphone adapter which enables connection with a plurality of
cannon connectors and pin jacks.
[0073]
<Outer view> FIG. 5A shows a perspective view of the microphone adapter of the second
embodiment.
The microphone adapter main body 1b of this embodiment includes two jacks CJ2 and CJ3 for
cannon connectors.
On the back, two pin jacks PJ1 and PJ2 are provided (see FIG. 7B).
The L-shaped member 2b is a locking means for fixing the microphone adapter main body 1b to
the video camera, and is fixed to the microphone adapter main body 1b by a screw or other
method using a screw B.
The knobs 4a and 4b as crimping members are rotatably provided on the L-shaped member 2b.
The buffer material 5 is moved up and down by turning the knobs 4a and 4b in a predetermined
direction. The mat 3 b is an elastic member for preventing the damage of the video camera. The
microphone plug MICP2 and the cord C2 use the same ones as in the first embodiment. The
material of each member can be considered as in the first embodiment.
[0074]
<Circuit> FIG. 6 shows a circuit diagram of the connection conversion circuit 10b provided in the
inside of the microphone adapter main body 1b of the second embodiment and the periphery
thereof. In this embodiment, in addition to simultaneously connecting two business-use dynamic,
an audio signal from a line system is input via a pin jack.
[0075]
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18
The transformer T comprises two coils whose primary side has a low impedance (e.g. 600
[Omega]). The impedance on the secondary side is high impedance (for example, 50 kΩ). It is
assumed that the shape of the transformer is small and has a performance that distortion of the
audio signal does not occur due to saturation of the iron core.
[0076]
The resistors R3 and R4 and R5 and R6 not only perform impedance matching with the
peripheral device connected to the pin jack PJ1, but also function as an attenuator. Usually, the
voice signal level of the microphone is about -60 dBm, whereas the voice signal level of the line is
-20 dBm to +4 dBm, and the level ratio of the two ranges over 100 times. If an audio signal of a
line system is supplied directly to a jack for microphone input, the input is excessive and
distortion occurs, so it is necessary to insert an attenuator into the signal line. For example, to
reduce the voice signal from the -20 dBm pin jack by -40 dBm, the resistance ratio of R3 to R4
and R5 to R6 is set to 99: 1. Further, in order to perform impedance matching, the resistance
value is set such that the impedance when the connection conversion circuit 10b is viewed from
between the terminals of the pin jacks approaches the impedance (47 kΩ etc.) of the line.
Capacitors C3 and C4 work in the same manner as in the first embodiment.
[0077]
<Mounting Method> FIG. 7 shows a mounting explanatory view of the microphone adapter of the
second embodiment. As shown in FIG. 7, the microphone adapter of the second embodiment uses
a plate-like object such as a grip of a video camera as a locking object.
[0078]
In order to attach the microphone adapter, at first, the knobs 4a and 4b are turned to raise the
shock absorbing material 5. The microphone adapter body 1b is moved in the direction of the
arrow shown in the figure, and the grip 21 of the video camera is inserted into the L-shaped
member 2b. After turning the knobs 4a and 4b, the grip 21 is sandwiched between the buffer 5
and the mat 3b to fix the microphone adapter 1b. If the two cannon connector plugs CP1 and
CP2 can be connected and the pin plugs PP1 and PP2 can be connected.
01-05-2019
19
[0079]
<Advantage> The microphone adapter of the first embodiment having the above-described
configuration has the following advantages. i) In this embodiment, since the impedance matching
is perfect, two dynamic microphones can be connected to the jack for the canon connector
simultaneously.
[0080]
ii) Attenuator allows line input to be supplied to the video camera without distortion.
[0081]
iii) Since each of the pin jacks is connected to the R contact and L contact of the microphone plug
MICP2, if left and right audio signals are supplied to each of the pin jacks, stereo recording can
be performed by line input.
[0082]
iv) Since the locking means of the structure pinched by the knob is provided, the microphone
adapter can be fixed not only to the grip of the video camera but also to the plate-like member.
For example, it can be fixed to a user's belt, a shoulder belt, a battery case or the like.
[0083]
v) Prevent the mat from scratching the video camera.
[0084]
(III) Third Embodiment A third embodiment of the present invention relates to a microphone
adapter which employs a belt which is a belt-like member as a locking means and has a
connection switching function and a switchable attenuator.
01-05-2019
20
[0085]
<Exterior> FIG. 8 shows the outline of the microphone adapter of the third embodiment.
The microphone adapter main body 1c of this embodiment includes two jacks CJ4 and CJ5 for
cannon connectors.
On the back side, a mini jack MJ3 and a pin jack PJ3 are provided (see FIG. 7B).
Further, the microphone adapter main body 1c is provided with a belt side 6a which is a belt-like
member, and the belt side 6a is provided with a fastener 6b. The central portion of the belt side
6a is fixed to the microphone adapter body 1c. The switch 11 is a switch that switches the level
of the attenuator to be inserted into the line input.
[0086]
<Circuit> FIG. 9 shows a circuit diagram of the connection conversion circuit 10c provided inside
the microphone adapter main body 1c of the third embodiment and the periphery thereof. The
resistor R7 performs impedance matching of the canon connector jack CJ4 and the resistor R9
performs impedance matching of the canon connector jack CJ5. The resistor R8 is a resistor that
synthesizes the audio signal from CJ4 and the resistor R10 is a signal from CJ5. The mini jack
MJ3 has three contact points. In the mini jack MJ3, the first contact that is in direct contact when
the mini plug is inserted is connected to the R contact (or L contact) of the microphone plug
MICP3 via the capacitor C5. On the other hand, when the mini plug is not inserted, it contacts the
first contact, and when the mini plug is inserted, the second contact that is not in contact with
the first contact is the audio signal system (R8 and Connect to R10).
[0087]
In the pin jack PJ 3, the audio signal terminal is connected to the “0 dB” side contact of the
switch 11. Furthermore, the “0 dB” side contact is connected to the “ATT” side contact of
the switch 11 via the resistor R12. The central contact of the switch 11 is connected to the L
contact (may be the R contact) of the microphone plug MICP3 via the capacitor C6. The resistor
01-05-2019
21
R13 is a resistor for performing impedance matching with a peripheral device connected to the
pin jack PJ3.
[0088]
In the above circuit configuration, since impedance matching is performed, dynamic
microphones can be simultaneously connected to the canon connector jacks CJ4 and CJ5. When
the plug is not inserted into the mini jack MJ3, the first contact and the second contact of the
mini jack MJ3 are in electrical contact. An audio signal supplied from the dynamic microphone
via the jacks CJ4 and CJ5 is transmitted from the second contact of the mini jack MJ3 to the first
contact and supplied to the microphone plug MICP3. On the other hand, when the mini plug is
inserted into the mini jack MJ3, the second contact is not in contact with the first contact, so that
the audio signal from the canon connector is cut off. Instead, an audio signal from the
microphone connected to the mini jack MJ3 is supplied to the microphone plug MICP3. That is, if
a microphone is not connected to the mini jack MJ3, voice can be input from the dynamic
microphone, and if a microphone is connected to the mini jack MJ3, voice can be automatically
input only from the microphone connected to the mini jack MJ3.
[0089]
In the pin jack PJ3, when the level of the audio signal supplied from the peripheral device is the
same level as the microphone input (for example, about -60 dBm), the switch 11 is switched to
the "0 dB" side contact. The audio signal from the pin jack PJ3 is supplied to the microphone
plug MICP3 without attenuation. On the other hand, when the level of the audio signal is a
normal line input level (for example, -20 dBm or more), the switch 11 is switched to the "ATT"
side contact. The audio signal from the pin jack PJ3 is divided by the resistors R12 and R13,
attenuated and supplied to the microphone plug MICP3. For example, if the resistance ratio
between the resistors R12 and R13 is selected to be 99: 1, an attenuator of -40 dB is constructed.
[0090]
<Mounting Method> FIG. 10 shows a mounting explanatory view of the microphone adapter of
the third embodiment. The locking means of the microphone adapter of this embodiment is
effective when there is no plate-like body such as a grip in a video camera etc. which is a locking
01-05-2019
22
object. That is, even in the case of using a box-shaped video camera 25 as shown in FIG. 10, the
microphone adapter main body 1c can be fixed to the video camera 25. The fixing method is to
rotate the belt 6a of the microphone adapter so as to hold the body of the video camera 25, and
tighten the fastener 6b through the end of the belt 6a. You can choose the direction in which the
microphone adapter is attached so that the plug connected to each jack does not get in the way
when it is used.
[0091]
Advantages The advantages of the microphone adapter of the third embodiment are as follows. i)
Since the belt is provided, any shape can be selected as the locking object. Besides being attached
to the video camera body, it can be attached to a portable cassette recorder, a portable DAT, a
user's arm or back.
[0092]
ii) By inserting the plug into the mini jack, the connection of the jack for the canon connector can
be disconnected, which is convenient when the consumer microphone and the dynamic
microphone are used alternatively.
[0093]
iii) It is possible to select whether the attenuator should be inserted into the pin jack or not with
the switch, so if the input signal level of the pin jack greatly changes, reduce the level difference
with the audio signal level via other microphones It can be selected.
[0094]
vi) Prevent the mat from scratching the video camera.
[0095]
(IV) Fourth Embodiment A fourth embodiment of the present invention relates to a microphone
adapter attachable to a shoe (socket) for an adapter as a locking means.
[0096]
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23
<Outline> FIG. 11 shows an outline view of the microphone adapter of the fourth embodiment.
The same figure (A) is a perspective view of the microphone adapter of this form.
The microphone adapter main body 1d, the cord C4, the microphone plug MICP4 and the jack
CJ6 for the canon connector can be considered in the same manner as the configuration
described in the first embodiment.
For example, a mini jack MJ4 is provided on the back surface of the microphone adapter main
body 1d (see FIG. 7B).
The circuit configuration inside the microphone adapter body 1d also conforms to the first
embodiment. However, a screw shaft 9a is provided vertically to the bottom surface of the lower
surface of the microphone adapter body 1d. The screw shaft 9a meshes with the screw groove,
and the knob 4c is rotatably provided. An insertion plate 8 is provided at the end of the screw
shaft 9a.
[0097]
<Installation explanatory drawing> FIG. 12 shows an installation explanatory drawing of the
microphone adapter of the fourth embodiment. As shown in FIG. 12, the microphone adapter of
this embodiment is inserted into and attached to an accessory shoe provided in a video camera
or the like. Usually, the shoe 26 is provided, for example, near the grip 21 of the video camera.
When the microphone adapter is attached, the insertion plate 8 a is inserted into the shoe 26.
After the insertion, the knob 4c is turned to clamp and fix the shoe 26 between the knob 4c and
the insertion plate 8a. The direction in which the microphone adapter is attached may be
selected so that the plug CP6 or MP4 does not interfere with shooting.
[0098]
Advantages The advantages of the microphone adapter of the fourth embodiment are as follows.
i) A microphone adapter can be attached like a normal video accessory.
01-05-2019
24
[0099]
ii) Therefore, it can be freely attached and detached, and the installation direction can be freely
selected.
[0100]
iii) High mounting strength.
[0101]
(V) Fifth Embodiment A fifth embodiment of the present invention relates to a microphone
adapter which provides a locking means utilizing a tripod mounting screw hole of a video camera
or the like.
[0102]
<Exterior> FIG. 13 shows an outline of the microphone adapter of the fifth embodiment.
The same figure (A) is a perspective view of this form.
The microphone adapter body 1e, the cord C5, the microphone plug MICP5 and the jack CJ7 for
the canon connector can be considered in the same manner as the configuration described in the
first embodiment.
For example, a pin plug PJ4 is provided on the back of the microphone adapter body 1e. The
circuit configuration inside the microphone adapter body 1e also conforms to the first
embodiment. However, a screw shaft 9b is fixed to the upper surface of the microphone adapter
body 1e. A knob 4 d is rotatably provided on the screw shaft 9 b.
[0103]
<Installation explanatory view> FIG. 14 shows an installation explanatory view of the microphone
adapter of the fifth embodiment. The microphone adapter of this embodiment is attached to a
01-05-2019
25
tripod mounting screw hole provided in a video camera as a standard. As shown in FIG. 14, the
tripod mounting screw hole 28 is provided on the bottom of the video camera 27. The screw
shaft 9b of the microphone adapter has a shape adapted to the screw hole. First, screw the screw
shaft 9 b into the screw hole 28. When the screw shaft 9 b is properly meshed with the screw
hole 28, the knob 4 d is rotated to crimp the knob 4 d to the bottom surface of the video camera
27. By crimping, the microphone adapter body 1 e can be fixed to the bottom of the video
camera 27. The direction of the microphone adapter may be selected so as not to disturb the
connection of the plugs CP7 and PP4.
[0104]
<Advantages> The advantages of the fifth embodiment of the microphone adapter are as follows.
i) When using a video camera by hand, screw holes for tripod mounting are not used. It is
possible to attach a microphone adapter using this screw hole.
[0105]
ii) Since the screw holes that are normally provided in ordinary video cameras are used, the
microphone adapter can be attached regardless of the shape of the video camera. (VI) Other
Embodiments Regardless of the above embodiments, the present invention can be modified into
the following various aspects. i) The number of commercial jacks (cannon connectors) provided
on the microphone adapter for jacks can be freely selected regardless of the above-mentioned
form. The number of mini jacks and pin jacks provided in combination with commercial jacks can
be freely selected.
[0106]
In addition, a switch may be provided to select whether to connect a commercial jack (cannon
connector jack) to the connection switching circuit. Alternatively, using the minijack described in
the third embodiment, a wiring may be applied in which any one of the plurality of business use
jacks is disconnected from the connection switching circuit when the miniplug is inserted.
[0107]
01-05-2019
26
ii) Connection switching circuit A DC-DC converter may be provided inside the connection
switching circuit to drive a professional condenser microphone. As a power source, a DC power
source supplied from the microphone jack of the video camera apparatus or a small built-in
battery is used. Since professional condenser microphones usually require a DC power supply of
48 V or ± 12 volts, the DC power supply (usually 5 V) supplied from the video camera device
runs short of voltage. Therefore, a DC-DC converter is provided to boost the DC power supply
voltage.
[0108]
iii) Attenuator In the above embodiment, although the attenuator is provided only for the pin
plug which is the input of the line system, a variable resistor may be provided for the input of the
business use jack. For example, in the circuit of FIG. 9, the resistors R7 and R9 are replaced with
variable resistors, and the center tap is connected to the resistors R8 and R10. This is effective
when the video camera apparatus does not have an input sensitivity adjustment function.
[0109]
In addition, a small head amplifier may be provided. As a power source, a DC power source
supplied from a video camera device or a small built-in battery is used. It is further preferable to
make the amplification factor of the head amplifier adjustable with a variable resistor. It is
possible to adjust the signal level while performing perfect impedance matching of the audio
signal input from the professional jack.
[0110]
iv) The outer shape of the microphone adapter can be selected variously regardless of the abovementioned respective forms. It is possible to connect each plug and have a convenient shape for
use. Also, if the type of video camera to be used is determined, the external shape of the
microphone adapter may be adapted to the shape of the specific video camera.
[0111]
In addition, regardless of each of the above-mentioned forms, the shape of holding using a clip
01-05-2019
27
etc., the shape of sticking using a seal or magnet etc, or the shape compatible with accessories
such as battery case etc. The shape etc. which were made can be considered.
[0112]
v) Regarding applications Although the above embodiments mainly aimed to be attached to a
video camera device, regardless of this, it is for consumer use that has an audio input terminal
such as a mini jack and supports recording from an external microphone or an external device.
The present invention is applicable to any recording device.
For example, the present invention can be applied to a portable cassette recorder, a portable
digital audio tape recorder (DAT), a recordable disc recorder, a digital cassette tape recorder, and
the like.
[0113]
According to the inventions of claims 1 to 13, since the output of the professional microphone is
received by the professional jack and output from the voice input plug to the voice input jack, a
consumer video camera which can not be achieved conventionally You can connect a
microphone jack to a professional microphone.
[0114]
In particular, according to the invention as set forth in claim 2, since the voice input plug is
connected not only to the business use jack but also to the consumer use jack, the use of a
business use microphone or the use of a normal consumer use microphone You can also.
It is possible to collect environmental sound from a consumer microphone by using a
professional microphone for targeted sound collection.
[0115]
According to the third aspect of the present invention, since the voice input plug is connected to
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28
the pin jack in addition to the business use jack, it is possible to use a business use microphone
or to input a line output from an external device. It is also possible to synthesize audio signals of
a line system as BGM or the like.
[0116]
According to the present invention, a plurality of microphones can be connected.
[0117]
According to the invention of claim 7, the switching contact type jack automatically switches
from the professional microphone to the consumer microphone.
[0118]
According to the inventions of claims 8 to 10, since the matching circuit performs impedance
matching, the maximum power can be supplied to the output destination, such as a video camera
apparatus, and distortion can also be minimized.
[0119]
According to the invention as set forth in claim 11, since the direct current component removing
circuit removes the direct current component supplied from the audio input jack via the audio
signal line and passes only the audio signal which is an alternating current component, the
dynamic microphone Even when connected, no noise is generated.
[0120]
According to the twelfth aspect of the invention, since the attenuator attenuates the excessive
input level, it is possible to prevent the occurrence of distortion due to the excessive input signal
level.
[0121]
According to the invention of claim 13, the switch can select the input signal level.
[0122]
According to the inventions of claims 14 to 21, since the locking means is provided, the
microphone adapter can be fixed to a locking target such as a video camera device, and the
mobility is enhanced.
01-05-2019
29
[0123]
According to the invention of claim 15 or 16, the microphone adapter can be securely fixed to a
plate-like body such as a grip of a video camera.
According to the sixteenth aspect of the present invention, the attachment and detachment are
easy.
[0124]
According to the seventeenth aspect of the invention, since the belt-like member is used, the
microphone adapter can be attached also to a video camera apparatus without grips and other
devices.
[0125]
According to the eighteenth aspect of the present invention, the microphone adapter can be fixed
to the camera or the like as an accessory, as in a normal camera accessory.
[0126]
According to the invention as set forth in claim 19, since the microphone adapter main body can
be normally locked in the tripod mounting screw hole for screwing to a tripod, it is mounted on a
locking target such as any video camera apparatus having a screw hole. It is possible.
[0127]
According to the invention as set forth in claim 20, since the elastic member serves as a cushion,
it can be fixed to the object to be locked without loosening the microphone adapter, in addition
to not damaging the object to be locked such as a video camera etc. .
[0128]
According to the invention of the twenty-first aspect, the microphone adapter can be installed at
a position apart from the voice input jack.
01-05-2019
30
For example, in addition to being installed in a video camera device, the user can hold the
microphone adapter or attach it to the back.
[0129]
Brief description of the drawings
[0130]
1 is an external view of a microphone adapter in the first embodiment of the present invention.
[0131]
2 is a circuit diagram of the microphone adapter in the first embodiment.
[0132]
3 is a mounting explanatory view of the microphone adapter in the first embodiment.
[0133]
4 is a mounting completed view of the microphone adapter in the first embodiment.
[0134]
5 is an outline view of a microphone adapter in the second embodiment of the present invention.
[0135]
6 is a circuit diagram of the microphone adapter in the second embodiment.
[0136]
7 is a mounting explanatory view of the microphone adapter in the second embodiment.
[0137]
8 is an outline view of a microphone adapter according to a third embodiment of the present
invention.
01-05-2019
31
[0138]
9 is a circuit diagram of the microphone adapter in the third embodiment.
[0139]
10 is a mounting explanatory view of the microphone adapter in the third embodiment.
[0140]
11 is an outline view of a microphone adapter according to a fourth embodiment of the present
invention.
[0141]
12 is a mounting explanatory view of the microphone adapter in the fourth embodiment.
[0142]
13 is an outline view of a microphone adapter in the fifth embodiment of the present invention.
[0143]
14 is a mounting explanatory view of the microphone adapter in the fifth embodiment.
[0144]
Explanation of sign
[0145]
CJ1 to CJ7: Cannon connector jacks CP1 to CP7 ... Cannon connector plugs MJ1 to MJ4 ... Mini
plugs for jacks MP1 to MP4 ... Mini plugs for plugs PJ1 to PJ4 ... Pin jacks PP1 to PP4 ... Pin
plugs MICP1 to MICP5 ... Microphone plug M Dynamic microphones C1 to C5 Cords 1a to 1e
Microphone adapter main body 2a U-shaped member 2b L-shaped member 3a to 3c Mat 4a to
4d Knob 5 buffer material 6a Belt , 6b: fastener, 8: insertion plate, 9a, 9b: screw shaft, 10a to
10c: connection switching circuit, 11: switch, 20, 25, 27: video camera, 21: grip, 23: lens, 24:
microphone Jack, 26 ... socket, 28 ... tripod mounting screw hole
01-05-2019
32
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